[FFmpeg-trac] #3884(avformat:open): Decoding specific MP3 file produces broken sound at the beginning if "-ss 0" is applied (was: Trimming specific MP3 file produces broken sound at the beginning if "-ss 0" is applied)

[FFmpeg]

#3884: Decoding specific MP3 file produces broken sound at the beginning if "-ss
0" is applied
-------------------------------------+-------------------------------------
             Reporter:  vilic        |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mp3          |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * status:  new => open
 * component:  undetermined => avformat
 * keywords:   => mp3 regression
 * version:  unspecified => git-master
 * analyzed:  1 => 0


Comment:

 For future tickets: Please always add the complete, uncut console output
 and please use internal encoders if they allow to reproduce the issue.

 Regression since 7546ac2f

 {{{
 $ ffmpeg -ss 0 -i input.mp3 out.wav
 ffmpeg version N-65810-g1b5ec6a Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Aug 22 2014 12:18:11 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      54.  6.100 / 54.  6.100
   libavcodec     56.  0.101 / 56.  0.101
   libavformat    56.  1.100 / 56.  1.100
   libavdevice    56.  0.100 / 56.  0.100
   libavfilter     5.  0.102 /  5.  0.102
   libswscale      3.  0.100 /  3.  0.100
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  0.100 / 53.  0.100
 Input #0, mp3, from 'input.mp3':
   Duration: 00:00:01.15, start: 0.025057, bitrate: 130 kb/s
     Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 128 kb/s
     Metadata:
       encoder         : LAME3.99r
     Side data:
       replaygain: track gain - -7.400000, track peak - unknown, album gain
 - unknown, album peak - unknown,
 Output #0, wav, to 'out.wav':
   Metadata:
     ISFT            : Lavf56.1.100
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono,
 s16, 705 kb/s
     Metadata:
       encoder         : Lavc56.0.101 pcm_s16le
 Stream mapping:
   Stream #0:0 -> #0:0 (mp3 (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 Input stream #0:0 frame changed from rate:44100 fmt:s16p ch:1 chl:mono to
 rate:44100 fmt:s16p ch:2 chl:stereo
 Input stream #0:0 frame changed from rate:44100 fmt:s16p ch:2 chl:stereo
 to rate:44100 fmt:s16p ch:1 chl:mono
 size=      98kB time=00:00:01.14 bitrate= 695.5kbits/s
 video:0kB audio:98kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.078125%
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3884#comment:1>
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